Steam-valve.



PATENTED JAN. 15., 1907.,

w BAKER STEAM VALVE. APPLICATION FILQD OCT 25,1906.

I [NVlj/VTOR A TTOR/VE Y5 To all whom 'iZim/ay' concern.-

nrrnn 'srA-rns Parana? orrron. I'WILFRED BAKER, or ABERDEEN, SOUTH DKoTA.

I 4 STEAM-VALVE.

Specification of Letters Patent.

Patented Jan. 15. 1907.

'Ilpplicatian tiled October 25, 1906- Serial No; 340.567. I

Be it; known that 1, WILFRED BAKER, a citizen of the United States,residing at Aberdeen in thecounty of Brown and State or South Dakota,have invented a new and useful steam valve, of Which the following is a-.specifiea ion.

"l KWBIlt-iCn relates to steam-engines,

-a.nd haS" for. its principal object to provide a novel-'iorinjofbalance-valvewhich may be placed: iiijposition Within the steam-chestand as a substitute for the ordinaiy D slidevalve. A further object ofthe invention is to provid a novel form of alve and valve-casingwhich-ana ytic made and sold as an article of manufacture and applied toexisting engines 1) zmerely removing the ordinary D slid eir'alve, thedevice being so constructed as to permit ready application and to secuie srean" tight, joints even where the valve-seat is worn.

n still further object of the invention is to provide a novel "form ofvalve and valve-cas which may be placed within an ordinary steam-chestas'a substitute for a D-valve or larger size, the valve forming the,subject of the present invention being of the piston. type andhaving afriction area much smaller than the slide-valve, while at the same timethere will be no excessive wear due to the piessuie exerted by: thesteam.

'With these and other objects in view, as will more fully hereinalierappear, the in veni-jion consists in certain novel iearures oi con;truotion and arran ement of parts. hereinafter fully described,illustrated in the accompanying drawings. and particularly pointed outin the appended claims. it being understood that. various changesin thelorm. proportions. size. and minor details of the structure may be madewithout depaiting from the spirit or sacrificing any of the advantagesof the invent ion.

to indicate corresponding parts throughout the several figures oi thedrawings.

The major-it v of tract-itm-cngincs and. 01 her forms 01 enginesemployed gi-neiallyi'oriarn' work. and the like are provided with Dslidc chest.

revent )ertect act-ion and it is usuall 'a l matter 01 considerabledifiiculiy and expense to repair engines of this type, especiallywherethey are located at a considerable distance from a machine-shop. l

In carrying out the present invention a balanced valve and an auxiliaryvalve-chamber are made, these being ofsuch construction that they may beplaced on the market as separate articles of'inanuiacture and readilyplaced in position in existing engines after the ordinary D-valve isremoved. a

The valve casing 10 is generally of semi. cylindrical form having a fiatlower face in which are formed two steam-inlet ports 11 and a centralexhaust-port 12, these being designed to be placed in alinement with thesimilar ports formed in the valve-seat oi the en ine and the casingbeing'held down to the valve-seat .bythe pressure of steam in the Inmany cases the valve-seats are worn from long use, and in order tosecure steamtight joints the lower face of the auxiliary casing isprovided with grooves extending t-ransverscl of the casing and on bothsides of each port, and in these grooves is placed a strip 1 5. t'or1ned0t Babbltt orother soft metal,

which will protrude slightly from the mouth of the groove and which willyield when the casing is forced or held down, so that it may accommodateitself to aworn valve-seat and form perfectly steam-tight joints betweenthe ports. v

The whole of the interior of the casing is hollow and is divided intothe inlet and exhaust ports by means of vertically-disposed partitions1'7, and to the end walls of the casing and through these partitions isbored a cylindrical passage 18 for the reception of the piston-valve 19.The piston-valve has a reduced central portion, so that it correspondsapproximately to the D valve in controlling the flow of steam. Theenlarged enddisks of the piston-valve fit snugly in place and arepreferably provided with grooves 01 the reception of metallicpacking-rings 20.1 In order to prevent loosening of the act-kingrings,the spaces between the partitions and the end walls of the casing areconnected by bridging-strips 22,

alinenient w th the bore and form gm es for the piston, so that itbecomes impossible for the latter to move out of place or for thepiswhich are arr ed in IIQ ' ton peeking-ring toihecome detached)" Byenlarging the areas of the ports the steam is allowed to flow freely,and=the qnantity of steam passing will he the same as that controlled bythe Dvalve for which the device is substitutedi- A1; tl-e'endofthepiston is arranged a guide 30 in the forlil of a pair-of parallelundercut ri'bs-whielf are arranged to be'engagedby an- 1o enlargedheadx31'on the valve-stem, so that the latter maybe properly eniagedwith the valvef and may pass through t e same stufiin boz'f-as-the oneconnected 'to-the slide- ,va ve -In order to hold the auxiliaryleasingfrorn longitudinal'movement, a numberof pinsj'34 are arranged inthreaded openingain the 0p osite end walls of the'cas'ing, and these mayI e'screwed in or out until they firmly engage with the inner end wallof,the steamehest, so

that the auxiliary casing will be held from movement. v

"Fhe device may be readily placed in posi- 'tion by an ordinaryniechanic o'r by the owner of'the engine without any -machine workwhatever, ;it being merely necessary to dis- I card the D-valye and itsstem and place the present device and new stem' in place, or the oldvalve-stem may be altered, if desired. In-

asmnch as-the 5v al v e is o piston typeand exposed topractically t esame-pressure at alloints, there will not he anyex'eesslvewear having aflat lower face andrg'rovijded with a cylindrical bore, there beingpartitions (livid lower face of saidcasingbei provldegl wtransversely-extending grooves between the ports,- said grooves beingfilled-with yieldable or 'ooinpressible' material, bridging-pieces inali'nement with the wall-oi the bore, and conheating the partitions,and, endwalls of the casing; a piston-valvemonnted in the o'ylini.drical bore, and a pair of spaced ribs-arranged" at one? end of thepiston and adapted for-the reception of the headof a vabve-s'tem.

Witnesses:

' -AUGUST Znsfrnow, 5 I. 0-. CIJRiISS.

"an the -valve ma be moved more readily thanthe D-valire this' be lg 0fespecial value where the enginels tobe reversed while under ingthe'casing into inlet and e'xlianst' ports -the zIn a device'of-theclass deserihe'd, 'a casing'

